If they were downloads or demo click on the game with the options key on your controller (Triangle shape) and hit delete. If you somehow stuck two discs in you are mistaken, but turn it off even unplug power and turn back on and eject to remove a stuck disc.
You can not play PlayStation 3 games on a PlayStation 1, but you can play PlayStation 1 games on a PlayStation 3. All of the PlayStation consoles are backwards compatible.
No. PlayStation 3 games are not backwards-compatible with the PlayStation 2.
You cannot play Playstation 4 games on a Playstation 4 console. You are also unable to play Playstation 3 games on the Playstation 4.
no the two systems can not play each others games
No as the PlayStation 3 Blu-Ray discs are too large to fit in the DVD slot on the PlayStation 2, although you can play most PlayStation 2 games on American PlayStation 3's and around 50% of PlayStation 2 games on European PlayStation 3's.
Playstation 3 can play old Playstation games, but Playstation 2 games are not compatible. You can load some playstation 2 games using the hard drive and an emulator, but not all.
No PlayStation 3 games do NOT work on the PlayStation 2 system.
you can only play playstation games on PlayStation 1, 2 and 3
no
No
no
No.